<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>实现两个数交换</title>
</head>
<body>
    <script>
        var name1 = 10;
        var name2 = 20;
        console.log('交换前：' + name1 + ',' + name2);
        console.log('交换后：' + name2 + ',' + name1);
    </script>
</body>
</html>